<template>
  <el-card class="box-card">
    <div slot="header" class="clearfix">
      <span>更换头像</span>
    </div>
    <div>
      <!-- 图片，用来展示用户选择的头像 -->
      <img :src="imgUrl" v-if="imgUrl" alt="" class="preview" />
      <img src="../../../assets/images/avatar.jpg" v-else alt="" class="preview" />

      <!-- 按钮区域 -->
      <div class="btn-box">
        <input type="file" style="display:none" ref="inpFile" @change="chooseImg">
        <el-button type="primary" icon="el-icon-plus" @click="$refs.inpFile.click()">选择图片</el-button>
        <el-button type="success" icon="el-icon-upload" :disabled="imgUrl === ''" @click="uploadAvatar">上传头像</el-button>
      </div>
    </div>
  </el-card>
</template>

<script>
export default {
  name: 'UserAvatar',
  data(){
    return {
        imgUrl:''   //保存base64字符串
    }
  },
  methods:{
    chooseImg(e){
        const files = e.target.files
        if(files.length){
            const reader = new FileReader()
            reader.readAsDataURL(files[0])
            reader.addEventListener('load',()=>{
                this.imgUrl=reader.result
            })
        }else {
            this.imgUrl = ''
        }
    },
    //上传图像
    async uploadAvatar(){
        const {data:res} = await this.$http.patch('/my/update/avatar',{avatar:this.imgUrl})
        if(res.code !==0) return this.$message.error(res.message)  //上传失败
        this.$message.success(res.message) //上传成功
        this.imgUrl=''
        this.$store.dispatch('initUserInfo')
    }
  }
}
</script>

<style lang="less" scoped>
.btn-box {
  margin-top: 10px;
}
.preview {
  object-fit: cover;
  width: 350px;
  height: 350px;
}
</style>
